Queries/Documentaion regarding Discovery Manager.

Hi,

I am new to the EMC Smats. I have some quieres regarding discovery manager like:

-> according to the Smarts flow after discovering  any device, all the data gets sync with AM-PM. I want to know the criteria behind this.

Ideally, when should data be sync with AP-PM?

I found the data some times get sync at the same time just after discovery and sometimes it takes time even a month. I have discovered twice some network devices a month back. Till now, i have not found those devices in AP-PM.

Also, please provide documentation regarding Discovery manager.